Elevator.



No. 636,202. Patented Oct. 3|, I899.

C. I. HALL.

ELEVATOR. (Application filed Jan. 22, 1897. Renewed July 24, 1899.) (No Model.) 2 Sheets-Sheet I;

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TNE uonms PETERS co. PHOTO-L'ITHD. WASHINGTON. a c.

Patented Oct. 3|,l899. I. HALL.

ELEVATOR.

(Application filed Jan. 22, 1897. Renewed July 24, 1899.)

2 Sheets-Sheet 2,

[No Model.)

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m: Nonms warms co, wncwoumu, WASNINGTON, u. c

UNITED STATES PATENT time.

OOFRAN ISRAEL HALL, OF SAN FRANCISCO, CALIFORNIA, ASSIGNOR TO JOHN J. MAHONY, OF SAME PLACE.

ELEVATOR.

SPECIFICATION forming part of Letters latent No. 636,202, dated October 31, 1899. Application filed January 22, 1897. Renewed July 24, 1899. Serial No. 725,011. (No model.)

To all whom it may concern:

Be it known that I, COFRAN ISRAEL HALL, a citizen of the United States, residing at San Francisco, county of San Francisco, and State of California, have invented certain new and useful Improvements in Elevators; and I hereby declare the following to be a full, clear, and exact description of my invention.

My invention relates to elevators for raising and lowering loads in buildings and to a method of connecting the motive power to the cages or platforms for passengers or goods by means of whatis technically called rope gearing, also to a division of the counterweight and the disposition of the two parts in series or one following the other,whereby the proper tension is maintained in the impelling-rope, which is located between the two counterweights.

My invention includes various features of a constructive nature, hereinafter pointed out and explained in connection with the drawings, and set forth in the claims at the end of this specification.

Referring to the drawings, Figure I is an elevation of an elevator constructed and operating according to my invention. Fig. II is a View at a right angle to Fig. I of the same elevator, the cage being indicated by dotted lines, so as to not obscure the parts behind; and Fig. III is a diagram to assist in more clearly explaining the manner of operating than is possible from the elevations alone.

The references apply alike in the three figures of the drawings.

Referring to Fig. I, the cage 1, shown as one for passengers, moves upward and downward between the guide-posts 2 by means of the rope 3, on which the cage is suspended. This rope 3 passes over the pulley l at the top and down to a counterweight 5, that moves coincidently and reversely to the cage 1. To the bottom of this weight 5 is attached a shackle 6 and sheave or pulley 7, around which passes the impelling-rope 8, the course and operation of which will be presently explained.

At one side of the elevator-shaft or wellway is placed two electric motors 9 and 10 or other suitable means of driving the impelling-pulleys 11 and 12 at varying rates of speed relatively. In the same plane with these impelling-pulleys 11 and 12 I place at a proper or convenient distance two other pulleys 13 and 14, the latter being in this case mounted on idle shafts 29 and 30; but these latter can be connected to the motors 9 and 10 or other motive power by belts or other gearing, and thus become impelling-pulleys, the same as 11 and 12.

Referring now to the driving or impelling rope 8 and beginning at the movable pulley 7, this rope 8 extends down to pulleys 12 and 14, twice or more around these, and then up to the pulley 15, held in the shackle 16, then over the pulley 15 and down to and twice around the pulleys ll and 13, and then up to the place of commencement at the pulley '7. The wraps around the pulleys 12 and 14 and 11 and 13 are as many as will produce the required traction. The shackle 16 is suspended on a rope 17, that passes over the pulley 18 at the top and is guided by notches in the ends of the cross-arm, Fig. II, corresponding to the grooves 25 in the weights 5 and 22 in Fig. I. The rope 17 after passing over the pulley 18 extends down to the auxiliary counterweight 22 and is attached thereto. The weights 5 and 22 move on the guides 23 24: coincidently up and down, being the same in respect. to counterweighting the cage 1 and a portion of its load, but with the dilference that the weight 22 produces the required tension on the impelling-rope 8, and the one 5 is a direct counterpoise by means of the rope 3.

Referring now to Fig.IlI,the tension-weight 22 is there shown on the left and in a different plane from the weight 5 in order to render explanation more clear. For illustration, if the cage 1 weighs two thousand pounds, the weight 5 twelve hundred pounds, and the weight 22 eight hundred pounds then there is equipose, the two weights 5 and 22 equaling the cage 1. For passenger-elevators, however, these weights are not thus proportioned. The sum of the two weights 5 and 22 is made as nearly as possible equal to the cage 1 and one-half of its service-load, so the motive power and strain on the rope 3 will be approximately the same when raising the cage 1 or in drawing it downward. This method of operating is, however, well understood and does not form any part of my present invention, the novel feature being in the division of the counterweight into two parts 5 and 22, the latter being enough to maintain tension of the impelling-rope S and the other portion 5 acting as a supplementary balance for the cage 1.

It will be seen that the counterweight 5 can be dispensed with, and the whole weight required can be concentrated in the one 22; but in that case the tension on the impellingrope would be excessive and cause undue strain on this rope and on the axis of the impelling-pulleys.

If all the counterweight was concentrated in 5, then there would be no tension on the impelling-rope 8 unless the ropes 3 and 17 were connected or combined, and in that case the impelling-rope 8 would be deprived of the take-up function of the extra weight, which now compensates for stretch and wearin the impelling-rope.

It will be understood that the weight of the counterpoise 22 depends upon the tractive force exerted by the pulleys 11 and 12, consequently upon the number of times the impelling-rope 8 is wrapped about the pulleys 11 and 18 and 12 and 11.

The method of operating can be explained by referring to Fig. III.

hen the two pulleys 11 and 12 are of the same size and revolving at the same rate, the impelling-rope 8 causes no movement of the pulleys 7 and 15; but if the rate of movement between the pulleys 11 and 12 is changed relatively either way then the pulleys 7 and 15 will be moved upward or downward oppositely and accordingly, the cage 1 being thus raised or lowered at a corresponding speed. It will be obvious that either or both of the pairs of pulleys l1 and 13 or 12 and 14: can be driven. The result will be the same,with the difference, however, that if all these pulleys are driven the number of wraps of the rope '8 can be less or the weight 22 can be reduced one-half.

Having thus explained the nature and objects of my invention, what I claim is- 1. In an elevator, a vertically-moving cage, a main counterweight, an auxiliary counterweight, a suspensory connection between the cage and the main counterweight, an intermediate fixed pulley sustaining the same, a movable sheave or pulley, a suspensoryconnection between the auxiliary counterweight and the said movable sheave or pulley, a fixed pulley sustaining the same, a pulley attached to the main counterweight, two electric motor shafts and pulleys adapted to run at variable speeds, fixed pulleys in a plane with the said motor-pulleys, and an endless wrapping connection passing around said movable pulleys, and fixed pulleys, and electric motor-pulleys, substantially as shown and described.

2. In an elevator, a vertically-moving cage, two counterweights balanced against the cage in series by intermediate connections, fixed pulleys sustaining said cage and weights, a pulley borne on one of the counterweights and moving with the same, a sheave or pulley connected with the other counterweight and moving oppositely to the same, two electric motor-shafts and pulleys adapted to run at variable speeds, fixed pulleys in the plane of the said motor-pulleys, and an endless wrapping connection passing around said movable pulleys, and fixed pulleys, and motor-pulleys, substantially as shown and described.

3. In an elevator, a vertically-moving cage, counterweights 5 and 22, suspensory connections for said cage and counterweights, fixed pulleys 4 and 18, movable pulleys 7 and 15, electric motor-pulleys 11 and 12, fixed idle pulleys 13 and 14, and an endless impellingrope 8 passing around said motor-pulleys, and movable pulleys, and idle pulleys, whereby the differential speed imparted to the motor-pulleys causes an opposite upward and downward movement of the said cage and counterweights respectively, substantially as shown and described.

4. In an elevator, a verticall y-m ovin g cage, two counterweights arranged in series with the cage, separate sustaining-pulleys for the two counterweights and their respective connections, two motor-shafts adapted to run at variable speeds, and an endless wrapping connection between and connected with the said counterweights, with suitable pulley connections, the said wrapping connection passing around the said motor-pulleys, whereby it serves as an impelling-rope to cause the relative opposite upward and downward movements of the said cage and the said counterweights respectively when differential motion occurs in the said motor-pulleys, substantially as shown and described.

In testimony whereof I have hereunto affixed my signature in the presence of two witnesses.

GOFRAN ISRAEL HALL.

Witnesses:

K. LocKwooD-NEvINs, H. SANDERSON. 

